With the box flattened and the ends masked off with paper, stamp a music border along each straight edge on the box sides. Let the ink dry before turning the box over and repeating on the opposite side. Assemble the box.

Cut a 1 ¼” square of white cardstock and ink the edges black. Write “Happy Birthday To You!” and foam tape to the left side of the tag. Use the ribbon to make a bow and glue to the top of the tag. Glue the tag to the side of the box.